Earth-anchor.



J. BLAGKBURN. EARTH ANCHOR.

APPLICATION FILED MAR.11, 1913; 1,080,041

Patented Dec. 2, 1913.

am Vfw ffy-f' STATES PATENT EEIGE.

JASPER BLACKBURN, 0F KIRKWOOD, MISSOURI.

EARTH-ANCHOR.

To all whomz' may concern:

Be it known that I, JASPER BLACKBURN, a citizen of the United States,and resident of Kirkwood, St. Louis county, Missouri, have inventedcertain new and useful Improvements in Earth-Anchors, of which thefollowing is a speciiication containing a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart hereof.

My invention relates to improvements in earth anchors, and the object ofmy invention is to provide an improved construction of the type ofanchor known as the inverted cone anchor, which is provided with a flatbase or body portion having a sleeve pro-k jecting upwardly from thebase to provide means for attaching the anchor to an anchor rod, andalso provided with a plurality of radially arranged, spaced apart pinswhich vary in height and which form a surface having a maximum ofholding efficiency in broken rock, or the like which is tamped upon theanchor.

With the above purposes in view my invent-ion consists in certain novelfeatures of construction and arrangement of parts as will be hereinafterdescribed, pointed out in the claims and illustrated by the accompanyingdrawings, in which- Figure l is a plan of one of my improved anchors;Fig. 2 is a transverse sectional ele vation taken on the line 2-2 ofFig. l; and Fig. 3 is a view on a reduced scale, showing my improvedanchor as in use.

Referring by numerals to the accompanying drawings: 5 designates thebase or body portion of the anchor which is substantially disk-shape andhas at its periphery a rib 6 which projects above the upper face of thebase. At the approximate center of the base there is a sleeve 7, thelower end of which is formed of a size to provide a seat 8.

' An ordinary anchor rod 9 is extended through the sleeve 7 and a nut 10is secured to the end of the rod and occupies the seat 8 formed in thebottom of the base. Formed on the upper surface of the base and integraltherewith are the radially arranged rows of pins or projections 11 whichare of Specification of Letters Patent.

Application led March 11, 1913.

Patented Dec. 2, 1913. Serial No. 753,609.

graduate sizes, the innermost pins of each row being the longest.

l2 designates pins which are formed like and arranged between each rowof the pins l1. The two pins 12 are slightly higher than the pins llnext adjacent them. As shown in Fig. 2, the tops of the pins 11 and l2form a surface something after the ap pearance of a terraced pyramid.

It is obvious that when broken stone or the like is placed upon the pinsand tamped the stone will be forced over the downwardly and outwardlyinclined surface formed by the tops of the pins to embed in the earthsurrounding the bore or opening in which the anchor is placed, as shownin Fig. 3, and that the uneven surface presented by the pins of varyingheights is a surface aiording a maximum of holding efficiency in thetamped broken stone.

I claim:

l. As a new article of manufacture, an earth anchor, comprising a flatbase arranged to be secured to an anchor rod, and a plurality of pins ofgraduate sizes formed on the upper face of the base.

2. As a new article of manufacture, an earth anchor, comprising a flatdisk-shape base, a sleeve formed integral with the base arranged toreceive an anchor rod and enlarged at its bottom to receive a nut on theend of the anchor rod, and a plurality of pins on the upper surface ofthe base arranged in radial rows, and the pins of each row being ofgraduate sizes.

3. As a new article of manufacture, an earth anchor, comprising a flatbase and a plurality of pins formed integral with the base, said pinsbeing arranged in radial rows and of graduate sizes, and pins arrangedbetween the rows of heights greater than the pins in the rows nextadjacent them.

In testimony whereof, I have signed my name to this specification, inpresence of two subscribing witnesses.

JASPER BLACKBURN.

Witnesses:

E. L. WALLACE, JOHN C. HIeDoN.

copies of this patent may be obtained for ive cents each, by addressingthe Commissioner of Patents, Washington, D. C.

